public class Circle {

	private double radius;
	
	public Circle() {
		this(1.0);
	}
	
	public Circle(double radius) {
		this.radius = radius;
	}
	
	public double getRadius() {
		return radius;
	}

	public void setRadius(double radius) {
		this.radius = radius;
	}

	public double getArea() {
		return radius * radius * Math.PI;
	}

}